Base



FIG. 1 is a perspective view of a base;

FIG. 2 is a top view of the base;

FIG. 3 is a bottom view of the base; and,

FIG. 4 is a side view of the base.

The broken lines in FIG. 3 illustrate unclaimed portions of the base and form no part of the claimed design. 

CLAIM The ornamental design for a base, as shown and described. 